da 1answer
Yagger's questions - Danish 1answer
57 questions.
Questions
Answers
If $\| \alpha(s) \| \leq \| \alpha(s_0) \| = R$, then the curvature $k(s_0)$ is greater than $1/R$
10
2
answers,
5
favourites,
263
views
differential-geometry
Vector norm such that $\| (1,i) \| = 6$
2
2
answers,
0
favourites,
36
views
linear-algebra
norm
Existence of matrices such that $\rho(A)+ \rho(B) \lt \rho(A+B)$
2
2
answers,
0
favourites,
19
views
linear-algebra
eigenvalues-eigenvectors
Show $\| X \| = \sqrt{X^* A X}$ is a norm
2
2
answers,
0
favourites,
48
views
linear-algebra
matrices
norm
Eigenvalues of product of positive semidefinite matrices are greater or equal to zero
2
2
answers,
0
favourites,
38
views
matrices
eigenvalues-eigenvectors
Proving differentiability of $f$ from bound
1
2
answers,
0
favourites,
30
views
real-analysis
multivariable-calculus
differential
Studying the existence of the partial derivatives of $f(x,y) = |x|$
1
answers,
0
favourites,
18
views
real-analysis
multivariable-calculus
partial-derivative
If $A \subset \mathbb{R}^n$ is bounded an open then every sequence of $A$ has a subsequence that converges to a point of $A$
1
1
answers,
0
favourites,
24
views
real-analysis
sequences-and-series
multivariable-calculus
convergence
Prove that $f(x,y)=1- \sqrt{|xy|}$ is not differentiable at $(0,0)$
2
3
answers,
0
favourites,
39
views
real-analysis
multivariable-calculus
Is an ideal of $R$ and ideal of every subset of $R$ that contains $I$?
1
0
answers,
0
favourites,
26
views
abstract-algebra
ideals
Question regarding the second isomorphism theorem proof
2
answers,
0
favourites,
35
views
abstract-algebra
ideals
Product of $\mathcal{C}^k$ multivariable functions is $\mathcal{C}^k$
0
answers,
0
favourites,
27
views
real-analysis
multivariable-calculus
Differentiability on a function from directional derivatives
2
2
answers,
1
favourites,
43
views
real-analysis
multivariable-calculus
$R$ is a unitary ring iff $R[[x]]$ is a unitary ring
2
2
answers,
0
favourites,
51
views
abstract-algebra
ring-theory
If $f:R \rightarrow R$ is an epimorphism, is $\hat f:\mathcal{M}_2 (R) \rightarrow \mathcal{M}_2 (R)$ an epimorphism?
3
0
answers,
2
favourites,
50
views
abstract-algebra
Proving a function $f:\mathbb{Z}_{nm} \rightarrow \mathbb{Z}_n \times \mathbb{Z}_m$ is an isomorphism
2
4
answers,
0
favourites,
82
views
abstract-algebra
ring-theory
modular-arithmetic
Is surface regularity preserved under diffeomorphisms?
1
0
answers,
1
favourites,
21
views
differential-geometry
Does a function have to be defined in a neighborhood of a point in order for a limit to exist?
3
2
answers,
0
favourites,
53
views
real-analysis
limits
multivariable-calculus
About proofs by contrapositive and proofs by contradiction
2
1
answers,
2
favourites,
191
views
logic
proof-writing
proof-theory
Uniform continuity of $\cos(x^2)$
2
answers,
0
favourites,
88
views
real-analysis
uniform-continuity
Quotient of uniformly continuous bounded functions is uniformly continuous
1
answers,
0
favourites,
39
views
real-analysis
multivariable-calculus
uniform-continuity
Is $f(x,y)=\frac{y}{x^2 +1}$ uniformly continuous?
3
3
answers,
1
favourites,
72
views
multivariable-calculus
uniform-continuity
Multivariable limit in terms of $\alpha$ and $\beta$
1
answers,
0
favourites,
48
views
multivariable-calculus
Showing that a given curve is a circumference
1
2
answers,
0
favourites,
36
views
differential-geometry
Interpretation of the evolvent of a curve
1
1
answers,
0
favourites,
36
views
differential-geometry
curves
Conditions for the sum of two positive semidefinite matrices to be positive definite
0
answers,
0
favourites,
19
views
matrices
positive-definite
Question about Riemann integral property proof
1
2
answers,
0
favourites,
44
views
riemann-integration
2-norm of product of normal matrix and vector
1
answers,
0
favourites,
15
views
numerical-methods
norm
Householder transformation preserves $2$-norm
1
answers,
0
favourites,
24
views
linear-algebra
matrices
norm
Horn's Matrix Analysis, exercise about eigenvalues, page 45
0
answers,
0
favourites,
15
views
eigenvalues-eigenvectors
1
2
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